Problem—I configured a permanent virtual circuit (PVC) between T1, E1, T3, or E3 interfaces on a J-series Services Router and another vendor's router, and packets are being dropped and ping fails.
Solution—If the other vendor's router does not have the same FRF.12 support as the J-series router or supports FRF.12 in a different way, the J-series interface on the PVC might discard a fragmented packet containing FRF.12 headers and count it as a "Policed Discard." As a workaround for this problem, configure multilink bundles on both peers, and configure fragmentation thresholds on the multilink bundles.